| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of automatically extracting a keyword useful for narrowing down dialog purposes and performing retrieval by using the keyword.SOLUTION: The retrieval server executes processing for extracting a character string having a predetermined number of characters from dialog data, obtaining the dialog data including the extracted character string, extracting a non-language feature amount indicating the feature amount of information other than language information for the obtained dialog data, calculating a statistical amount indicating the unevenness of the distribution of the extracted non-language feature amount, and outputting at least a character string having a smallest statistical amount as a retrieval keyword. Thus, by using the keyword in which the dispersion value of the non-language feature amount of the dialog is small, a plurality of dialogs highly likely be similar in purpose can be retrieved.SELECTED DRAWING: Figure 1 |
